Statements Of Cash Flows (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Operating activities:
Net loss	$ (3,363,537)	$ (4,077,854)
Adjustments to reconcile net loss to cash used in operating activities:
Depreciation and amortization	1,119,108	1,150,162
Share-based compensation	321,869	494,616
Allowance for excess inventory quantities		2,728
Loss on disposal of equipment		1,023
Changes in assets and liabilities related to operations:
Trade accounts receivable	(113,350)	93,456
Other receivables	548	463,729
Inventories	487,672	(944,284)
Prepaid expenses and other assets	(44,540)	(52,188)
Accounts payable	(561,318)	673,981
Accrued expenses	(762,052)	747,749
Net cash used in operating activities	(2,915,600)	(1,446,882)
Investing activities:
Acquisition of equipment and leasehold improvements	(85,987)	(253,450)
Payment of accounts payable incurred for the purchase of equipment and leasehold improvements	(52,444)	(10,873)
Purchases of investments		(3,999,502)
Sales of investments		7,564,106
Net cash (used in) provided by investing activities	(138,431)	3,300,281
Financing activities:
Principal payment on debt obligations, including capital leases	(748)	(8,470)
Proceeds from exercise of stock options	4,080
Net cash provided by (used in) financing activities	3,332	(8,470)
(Decrease) increase in cash and cash equivalents	(3,050,699)	1,844,929
Cash and cash equivalents at beginning of period	5,744,322	3,899,393
Cash and cash equivalents at end of period	2,693,623	5,744,322
Supplemental cash flow information:
Interest paid	4,012	2,326
Supplemental non-cash investing and financing activities:
Accounts payable incurred for the purchase of equipment and leasehold improvements	$ 14,941	$ 52,444